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Kernel/SMP: Change critical sections to not disable interrupts

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Leave interrupts enabled so that we can still process IRQs. Critical
sections should only prevent preemption by another thread.

Co-authored-by: Tom <tomut@yahoo.com>
This commit is contained in:
Andreas Kling 2021-08-10 01:56:21 +02:00
parent 364134ad4b
commit 0a02496f04
6 changed files with 42 additions and 60 deletions
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9
Kernel/Arch/x86/common/Processor.cpp
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@ -658,9 +658,9 @@ void Processor::exit_trap(TrapFrame& trap)
void Processor::check_invoke_scheduler()
{
InterruptDisabler disabler;
VERIFY(!m_in_irq);
VERIFY(!m_in_critical);
VERIFY_INTERRUPTS_DISABLED();
VERIFY(&Processor::current() == this);
if (m_invoke_scheduler_async && m_scheduler_initialized) {
m_invoke_scheduler_async = false;
@ -732,7 +732,7 @@ ProcessorMessage& Processor::smp_get_from_pool()
u32 Processor::smp_wake_n_idle_processors(u32 wake_count)
{
VERIFY(Processor::in_critical());
VERIFY_INTERRUPTS_DISABLED();
VERIFY(wake_count > 0);
if (!s_smp_enabled)
return 0;
@ -817,8 +817,7 @@ bool Processor::smp_process_pending_messages()
VERIFY(s_smp_enabled);
bool did_process = false;
u32 prev_flags;
enter_critical(prev_flags);
enter_critical();
if (auto pending_msgs = m_message_queue.exchange(nullptr, AK::MemoryOrder::memory_order_acq_rel)) {
// We pulled the stack of pending messages in LIFO order, so we need to reverse the list first
@ -882,7 +881,7 @@ bool Processor::smp_process_pending_messages()
halt_this();
}
leave_critical(prev_flags);
leave_critical();
return did_process;
}